Journal
PLANT SCIENCE
Volume 281, Issue -, Pages 206-212Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2019.01.010
Keywords
NADP-ME; Malate; Pyruvate; NADPH; ROS; Biotic/abiotic stress
Categories
Funding
- National Natural Science Foundation of China [31700227]
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Under natural conditions, plants constantly encounter various fluctuating environmental stresses, which potentially restrict plant growth, plant development and even limit crop productivity. In addition to carbon fixation activity in C4 photosynthesis, NADP-dependent malic enzyme (NADP-ME) has been suggested to play important roles in diverse stress responses in plants. NADP-ME is one of the essential enzymes metabolizing malate, which is important for stabilizing cytoplasmic pH, controlling stomatal aperture, increasing resistance to aluminum excess and pathogen. Pyruvate, another product of NADP-ME reaction, participates in the synthesis of defense compounds such as flavonoids and lignin, which are involved in stresses tolerance such as mechanical wounding and pathogen invasion. Moreover, NADP-ME provides essential reductive coenzyme NADPH in the biosynthesis of flavonoids and lignin. On the other hand, NADPH is crucial for reactive active species (ROS) metabolizing systems such as the ascorbate-glutathione pathway and NADPH-dependent thioredoxin reductase, and is also required by apoplastic oxidative burst in most plant-pathogen interactions. This mini-review is largely focus on the characteristics of gene expression and activity of NADP-ME, as well as its interaction with ROS signaling under a variety of biotic and abiotic stress responses, which will provide a theoretical foundation for breeding of stress resistant crops.
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